1312221220291 has 2 divisors, whose sum is σ = 1312221220292. Its totient is φ = 1312221220290.

The previous prime is 1312221220267. The next prime is 1312221220357. The reversal of 1312221220291 is 1920221222131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312221220291 - 2²¹ = 1312219123139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312221226291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656110610145 + 656110610146.

It is an arithmetic number, because the mean of its divisors is an integer number (656110610146).

Almost surely, 2^{1312221220291} is an apocalyptic number.

1312221220291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312221220291 is an equidigital number, since it uses as much as digits as its factorization.

1312221220291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 1312221220291 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred ninety-one".